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author | NeilBrown <neilb@suse.de> | 2006-06-26 00:27:45 -0700 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 09:58:38 -0700 |
commit | e16b68b6e456a61b895a198baf5aa473cf2a32bf (patch) | |
tree | 0d592ee3c7245f4958dcd337cc506e650cefac2c | |
parent | ec7a3197f4777eff5039251d0e08a031b3372d6c (diff) | |
download | linux-e16b68b6e456a61b895a198baf5aa473cf2a32bf.tar.gz linux-e16b68b6e456a61b895a198baf5aa473cf2a32bf.tar.bz2 linux-e16b68b6e456a61b895a198baf5aa473cf2a32bf.zip |
[PATCH] md/bitmap: use set_bit etc for bitmap page attributes
In particular, this means that we use 4 bits per page instead of a whole
unsigned long.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r-- | drivers/md/bitmap.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index 0f1732570770..2e257d5998bc 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -700,27 +700,27 @@ static void bitmap_file_kick(struct bitmap *bitmap) } enum bitmap_page_attr { - BITMAP_PAGE_DIRTY = 1, // there are set bits that need to be synced - BITMAP_PAGE_CLEAN = 2, // there are bits that might need to be cleared - BITMAP_PAGE_NEEDWRITE=4, // there are cleared bits that need to be synced + BITMAP_PAGE_DIRTY = 0, // there are set bits that need to be synced + BITMAP_PAGE_CLEAN = 1, // there are bits that might need to be cleared + BITMAP_PAGE_NEEDWRITE=2, // there are cleared bits that need to be synced }; static inline void set_page_attr(struct bitmap *bitmap, struct page *page, enum bitmap_page_attr attr) { - bitmap->filemap_attr[page->index] |= attr; + __set_bit((page->index<<2) + attr, bitmap->filemap_attr); } static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, enum bitmap_page_attr attr) { - bitmap->filemap_attr[page->index] &= ~attr; + __clear_bit((page->index<<2) + attr, bitmap->filemap_attr); } static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page, enum bitmap_page_attr attr) { - return bitmap->filemap_attr[page->index] & attr; + return test_bit((page->index<<2) + attr, bitmap->filemap_attr); } /* @@ -872,7 +872,12 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) if (!bitmap->filemap) goto out; - bitmap->filemap_attr = kzalloc(sizeof(long) * num_pages, GFP_KERNEL); + /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ + bitmap->filemap_attr = kzalloc( + (((num_pages*4/8)+sizeof(unsigned long)-1) + /sizeof(unsigned long)) + *sizeof(unsigned long), + GFP_KERNEL); if (!bitmap->filemap_attr) goto out; |